首页
登录
职称英语
In this section, you will hear a short passage. For questions 21—30, complete th
In this section, you will hear a short passage. For questions 21—30, complete th
游客
2024-08-06
28
管理
问题
In this section, you will hear a short passage. For questions 21—30, complete the notes using no more than three words for each blank. The passage will be read only once. Remember to write the answers on the answer sheet.
-The ocean is still salty.
-Evaporated water leaves【D1】______behind, which makes the ocean salty.
-How did oceans form?
- It is said that oceans formed at least【D2】______ago.
- Atmosphere and clouds on the Earth are gasses, such as【D3】______ escaping from the planet’s interior.
-Were oceans in the past as salty as they are today?
-Oceans were not so salty in【D4】______state.
-With【D5】______ sweeping over the planet’s【D6】______and filtering down to the hollows , materials containing ingredients of salt were picked up.
- Chlorine, came from the【D7】______and gaseous fallout of land and【D8】______volcanoes.
-The oceans’ salt content increases because of the steady flow of【D9】______and streams and the【D10】______of volcanoes and undersea vents. [br] 【D1】
I know why the ocean is still salty: evaporated water leaves the salt behind. But how did it get salty in the first place?
According to one hypothesis, oceans formed at least 500 million year ago when water vapor and other gasses escaped from the Earth’s interior gradually formed the atmosphere and clouds surrounding the planet. As the earth cooled below the boiling point of water, rain began to fall, and kept falling for centuries. Eventually the rainfall filled the Earth’s hollows and formed oceans.
In their infant state these oceans were not nearly as salty as they are today. As the initial rains swept over the planet’s surface and filtered down to the hollows, the rushing waters picked up chemicals from erosion of the Earth’s crust. These chemicals included sodium, which is one of the main ingredients of salt. The other main ingredient, chlorine, came from the solid and gaseous fallout of land and ocean floor volcanoes. Over hundreds of millions of years, the steady flow of chemical-rich rivers and streams and the eruption of volcanoes and the undersea vents combined to increase the ocean’s salt content.
This does not mean, however, that the oceans’ saltiness is constantly increasing. Scientists believe that ocean salinity reached plateau hundreds of millions of years ago, when roughly the same amount of salt fed into the oceans was deposited as sediment on the ocean floor.
选项
答案
the salt
解析
(录音一开始就陈述了海水仍然是咸的,水分蒸发后盐分却还留在海里(evaporated water leaves the salt behind),因此应填the salt。)
转载请注明原文地址:https://tihaiku.com/zcyy/3707919.html
相关试题推荐
Thereisonepassageinthissectionwith10questions.Readthepassagequi
Thereisonepassageinthissectionwith10questions.Readthepassagequi
Thereisonepassageinthissectionwith10questions.Readthepassagequi
In,thissection,thereisonepassagefollowedbyasummary.Readthepassa
In,thissection,thereisonepassagefollowedbyasummary.Readthepassa
In,thissection,thereisonepassagefollowedbyasummary.Readthepassa
In,thissection,thereisonepassagefollowedbyasummary.Readthepassa
Inthissection,youwillhearashortpassage.Thereare10missingwordso
Inthissection,youwillhearashortpassage.Thereare10missingwordso
Inthissection,youwillhearashortpassage.Thereare10missingwordso
随机试题
[img]ct_epem_epelisv_01031(20097)[/img][br][originaltext]M:Hello,Davidspea
Name-callingandteasingareoverwhelminglythemaintypeofclassroombully
Onceitwaspossibletodefinemaleandfemaleroleseasilybythedivisiono
影响贷款价格的主要因素有( )。A.贷款费用 B.银行贷款的目标收益率
理财规划师对客户的职业建议的过程一般不包括()。A:试着让客户分析自己的性格、所
缩宫素兴奋子宫平滑肌的作用机制是A.激动H受体B.作用于α受体C.激动M受体D.
《隔离开关分合闸位置“双确认”改造技术规范》中姿态传感系统冲击电压试验,当额定工
实际工作中的材料采购,其具体表现不包括()。A.材料款已付,但采购成本不能确定,
根据《城市房地产抵押管理办法》,下列不得设定抵押的财产有()。A:权属有争议的房
细菌感染的来源不包括A、急性或慢性患者 B、带菌者 C、病兽 D、带菌动物
最新回复
(
0
)